Otdfbt

quite new to nginx and struggle to make the simplest thing running on digitalocean ubuntu 16.04 server. I have a node.js app running behind pm2 and this works fine with requests to mydomain.com:5002/endpoint. However, I can't get it working on a separate location like /app, constantly getting 404.
here's the /etc/nginx/sites-available/default :

server 
 listen 80 default_server;
 listen [::]:80 default_server;

 root /var/www/html;
 server_name mydomain.com;
 location /app/ 
 proxy_pass http://localhost:5002;
 

 location / 
 # First attempt to serve request as file, then
 # as directory, then fall back to displaying a 404.
 try_files $uri $uri/ =404;
 



 # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
 #
 # include snippets/fastcgi-php.conf;
 #
 # # With php7.0-cgi alone:
 # fastcgi_pass 127.0.0.1:9000;
 # # With php7.0-fpm:
 # fastcgi_pass unix:/run/php/php7.0-fpm.sock;
 #

 # deny access to .htaccess files, if Apache's document root
 # concurs with nginx's one
 #
 #location ~ /.ht 
 # deny all;
 #
}

If you have your pm2 running on example.com:5002/endpoint than your location block needs to state:

location /app
proxy_pass http://localhost:5002/endpoint;


and you should be able to access your nodejs app on URL: http://example.com/app

for further reference you can refer to: https://devtidbits.com/2015/12/08/nginx-as-a-reverse-proxy-to-apache-tomcat/ it deals with the same setup only the port is different.